 /*******************************************************************************
  * Copyright (c) 2004, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.console;

 import org.eclipse.jface.text.ITypedRegion;
 import org.eclipse.swt.custom.StyleRange;
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.ui.console.ConsolePlugin;
 import org.eclipse.ui.console.IOConsoleInputStream;
 import org.eclipse.ui.console.IOConsoleOutputStream;

 /**
  * A region in an IOConsole's document.
  * @since 3.1
  *
  */
 public class IOConsolePartition implements ITypedRegion {
     public static final String OUTPUT_PARTITION_TYPE = ConsolePlugin.getUniqueIdentifier() + ".io_console_output_partition_type"; //$NON-NLS-1$
 public static final String INPUT_PARTITION_TYPE = ConsolePlugin.getUniqueIdentifier() + ".io_console_input_partition_type"; //$NON-NLS-1$

     /**
      * The data contained by this partition.
      */
     private StringBuffer buffer;
     private String type;
     private int offset;
     /**
      * Output partitions are all read only.
      * Input partitions are read only once they have been appended to the console's input stream.
      */
     private boolean readOnly;
     
     /**
      * Only one of inputStream or outputStream will be null depending on the partitions type.
      */
     private IOConsoleOutputStream outputStream;
     private IOConsoleInputStream inputStream;
     private int length;
     
     /**
      * Creates a new partition to contain output to console.
      */
     public IOConsolePartition(IOConsoleOutputStream outputStream, int length) {
         this.outputStream = outputStream;
         this.length = length;
         this.type = OUTPUT_PARTITION_TYPE;
         this.readOnly = true;
     }
     
     /**
      * Creates a new partition to contain input from a console
      */
     public IOConsolePartition(IOConsoleInputStream inputStream, String text) {
         this.inputStream = inputStream;
         buffer = new StringBuffer (text);
         length = text.length();
         this.type = INPUT_PARTITION_TYPE;
         this.readOnly = false;
     }
     
     /**
      * Inserts a string into this partition
      * @param s The string to insert
      * @param offset the offset in the partition
      */
     public void insert(String s, int insertOffset) {
         buffer.insert(insertOffset, s);
         length += s.length();
     }
       
     /**
      * Deletes data from this partition.
      * @param delOffset
      * @param delLength
      */
     public void delete(int delOffset, int delLength) {
         buffer.delete(delOffset, delOffset+delLength);
         length -= delLength;
     }
     
     /*
      * (non-Javadoc)
      * @see org.eclipse.jface.text.ITypedRegion#getType()
      */
     public String getType() {
         return type;
     }

     /*
      * (non-Javadoc)
      * @see org.eclipse.jface.text.IRegion#getLength()
      */
     public int getLength() {
         return length;
     }

     /*
      * (non-Javadoc)
      * @see org.eclipse.jface.text.IRegion#getOffset()
      */
     public int getOffset() {
         return offset;
     }
     
     /**
      * Sets this partitions offset in the document.
      * @param offset This partitions offset in the document.
      */
     public void setOffset(int offset) {
         this.offset = offset;
     }
     
     /**
      * Sets this partitions length
      *
      * @param length
      */
     public void setLength(int length) {
         this.length = length;
     }
     
     /**
      * Returns the data contained in this partition.
      * @return The data contained in this partition.
      */
     public String getString() {
         return buffer != null ? buffer.toString() : ""; //$NON-NLS-1$
 }
     
     /**
      * Returns a StyleRange object which may be used for setting the style
      * of this partition in a viewer.
      */
     public StyleRange getStyleRange(int rangeOffset, int rangeLength) {
         return new StyleRange(rangeOffset, rangeLength, getColor(), null, getFontStyle());
     }

     private int getFontStyle() {
         if (type.equals(INPUT_PARTITION_TYPE)) {
             return inputStream.getFontStyle();
         }
         return outputStream.getFontStyle();
     }

     public Color getColor() {
         if (type.equals(INPUT_PARTITION_TYPE)) {
             return inputStream.getColor();
         }
         return outputStream.getColor();
     }

     public boolean isReadOnly() {
         return readOnly;
     }
     
     public void setReadOnly() {
         readOnly = true;
     }

     public void clearBuffer() {
         buffer = null;
     }
     
     IOConsoleOutputStream getStream() {
         return outputStream;
     }
 }

